Based on all the suggestions I've received, it looks like I'm going to
need to go the "VPS" route. And I'll most likely start with the folks
at prgmr.com - they seem to have the best pricing model, and they also
provide detailed instructions on set-up, including a detailed How-To for
NetBSD Xen DOMU.

Now I've just got to figure out how to set-up IPSEC tunnel between the
VPS machine and the rest of my network!